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Extend and customize Drupal functionality with contributed modules.
If a module doesn't quite do what you want it to do, if you find a bug or have a suggestion, then join forces and help the module maintainer. Or, share your own by starting a new module.

A CAPTCHA is a challenge-response test most often placed within web forms to determine whether the user is human. The purpose of CAPTCHA is to block form submissions by spambots, which are automated scripts that post spam content everywhere they can. The CAPTCHA module provides this feature to virtually any user facing web form on a Drupal site.

Co-maintainer wanted

We do this our spare time, which is unfortunately almost nonexistent at the moment due to real life obligations. To give the CAPTCHA module the required level of maintenance, an extra co-maintainer would be welcome. If you're interested in helping with this very popular module, please contact me or open an issue in the CAPTCHA module issue tracker.

Mollom is an intelligent content moderation web service. By monitoring content activity on all sites in the Mollom network, Mollom is in a unique position to determine if a post is potentially spam; not only based on the posted content, but also on the past activity and reputation of the poster. In short, Mollom handles incoming posts intelligently, in much the same way a human moderator decides what posts are acceptable. Therefore, Mollom enables you to allow anonymous users to post comments and other content on your site.

#D8CX: I pledge that Honeypot will have a full Drupal 8 release on the day that Drupal 8 is released.

Honeypot uses both the honeypot and timestamp methods of deterring spam bots from completing forms on your Drupal site (read more here). These methods are effective against many spam bots, and are not as intrusive as CAPTCHAs or other methods which punish the user [YouTube].

The module currently supports enabling for all forms on the site, or particular forms like user registration or password reset forms, webforms, contact forms, node forms, and comment forms.

The SpamSpan module obfuscates email addresses to help prevent spambots from collecting them. It implements the technique at the SpamSpan website (a German version is also available). The problem with most email address obfuscators is that they rely upon JavaScript being enabled on the client side. This makes the technique inaccessible to people with screen readers. SpamSpan however will produce clickable links if JavaScript is enabled, and will show the email address as example [at] example [dot] com if the browser does not support JavaScript or if JavaScript is disabled.

This technique is unlikely to be absolutely foolproof. It is possible in theory for a determined spambot to harvest addresses from your site no matter how you disguise them. But research suggests that the by far the great majority of spambots do not bother to attempt to collect addresses which have been hidden using JavaScript. Indeed, most spambots cannot currently read JavaScript at all.

Here are a links to the results of a few experiments into the efficacy of JavaScript obfuscation. Let me know if you know of any more.

Invisimail provides a content filter to hide email addresses from spam-bots. Email addresses are converted to ascii code and optionally written to the page using a concatenated JavaScript "write" command. The email addresses will appear on the page normally, but their html source will be obscured so as not to appear as an email address to email harvesting robots. Invisimail also provides an option to automatically create mailto links for email addresses.

Spambot protects the user registration form from spammers and spambots by verifying registration attempts against the Stop Forum Spam (www.stopforumspam.com) online database. It also adds some useful features to help deal with spam accounts.

This module works well for sites which require user registration before posting is allowed (which is most forums).

The purpose of Spamicide is to prevent spam submission to any form on your Drupal web site. Spamicide adds an input field to each form then hides it with css, when spam bots fill in the field the form is discarded. The field, and matching .css file, are named in such a way as to not let on that it is a spam defeating device, and can be set by admins to almost anything they like(machine readable please). If logging is set, the log will show if and when a particular form has been compromised, and the admin can change the form's field name (and corresponding .css file) to something else.

Description

Hidden CAPTCHA is an extension to the CAPTCHA module. It offers a hidden CAPTCHA (duh!)

The idea is very simple: If you offer an input box in any form, 99% of the time, robots will fill it with something before posting the form. If you offer an input box that has to stay empty, then the CAPTCHA system will prevent posts by robots.

This module allows you to add a Hidden CAPTCHA on forms where you don't absolutely need to have a human enter a text, number, etc. but that still needs a little anti-spam control.

How does it work?

This is just like any text CAPTCHA. You can set it up with a question specific to your website or that people just cannot answer in their right mind (i.e. How many stars are they in the Universe?) By changing the question regularly (once a month?) then you can prevent even more spam as the spammers need to adjust their robots to understand the new question (and some won't do that...) Long questions are better since they are not very likely to have been asked in any CAPTCHA before.

The CAPTCHA system will create a form with your question and an input box. The Hidden CAPTCHA system adds a specific CSS class to that form. The class references a CSS definition in the Hidden CAPTCHA file that says that the whole CAPTCHA box shall be hidden (i.e. display: none;).

AntiSpam module is the successor of the Akismet module, and it provides spam protection to your drupal site using external antispam service like Akismet.

AntiSpam module is fully compatible with Drupal 6.x (Akismet module for Drupal 6.x release had many compatibility issues and was not usable as it was), and it expanded the support of the external antispam service with TypePad AntiSpam and Defensio service as well as Akismet service. Now you can choose one of the antispam service you wish to use.

Bad Behavior is a set of PHP scripts which prevents spambots from accessing your site by analyzing their actual HTTP requests and comparing them to profiles from known spambots. It goes far beyond User-Agent and Referer, however.

IP Ranges is a module that let's you completely ban both single IP-addresses as well as
full ranges from your site. The ban is triggered already at the early bootstrap phase, so you
can get rid of unwanted visitors as early as possible without wasting server resources.

You can also define whitelists that override blacklists, both single and ranged.
The UI is similar to core ip-ban, so you will feel like home immediately.

INSTALLATION

Just enable the module as usual.

USAGE

After enabling the module, go to admin/config/people/ip-ranges to find form where you can enter either single IP-address or IP Range, and a list type.

IP-address range is entered in the form of 100.100.100.100 - 100.100.101.150.
(This is currently the only allowed range form, other types like bitmasks may come at later stage).

Type can be either "blacklist" or "whitelist",
where blacklisted IP's are denied from the site, and whitelisted are allowed.
Whitelists always override blacklists.

ALTERNATIVES

Restrict IP allows you to enter whitelists. All other IP's are banned.
Unlike IP Ranges, it does not actually restrict access to the page, but rather

Note: Social Sharing feature is available with LoginRadius FREE plan whereas Social Login feature is available with paid plan. To learn more about LoginRadius pricing, click here

Install this module and enable:

Social login - Eliminate traditional registration form and let your users sign-up in few seconds with their existing IDs such as Facebook, Twitter, Google, Amazon, Yahoo, Vkontakte and over 25 more. However, you can keep both traditional login system as well as social login. Integrating social login increases your sign-up rate up to 150% and you can quickly build a loyal customer base!

User Profile Data & Permissions - Every time a user logs in, it fetches user profile data and store them in your Drupal database. If required, it also gets online/offline access to a user’s social profile. For example - to post on a user’s Facebook profile, you request for permission and than can post on user’s behalf.

Social Analytics - The collect user profile data and IP based data are used to present a unique social analytics to understand your userbase. This helps you understand social network reach, demography and activities of your userbase on your website.

Module adds for certain forms two new elements — checkbox "I'm not a spammer" and hidden checkbox "I'm a spammer". If user not checked first checkbox or checked second checkbox, form not submitted and display warning message.

This email obfuscation module works similar to the technique described at the list apart article http://www.alistapart.com/articles/gracefulemailobfuscation/. It uses an input filter to "hide" email addresses, then uses javascript to "unhide" them for normal users. You can use this module anywhere you can use input filters (node body, CCK text fields, etc). This module also implements the core contact module for non-javascript browsers in order to keep clickable email links.